For the past year I've been using this Rubbermaid Handi-box Snap Case to pack my Canon 5D, Canon 24-70mm f/2.8 L lens, Canon 100mm f/2.8 L macro lens or a Canon 135mm f/2 lens (either/or), a pouch with extra batteries and CF cards, a blower, and a strap. The only part of the kit that won't fit in this plastic case are the two lens hoods for the lenses and they go in my LowePro Stealth Reporter 200 bag.
I'd put this stuff in the bag but in fact, it's better protected in this plastic case and the bag holds battery chargers and computer stuff I don't need on the plane.
The camera is in a small, padded Eagle Creek pouch and the lenses are in Zing lens pouches.
I've used this system to pack and check my camera gear on each of my JFK to LAX flights for the past year (7 trips) and it's worked beautifully. used to carry the Stealth Reporter bag on the plane as a carry on but given that I check a piece of luggage I figured why not check this stuff?
I also check a small Benro travel tripod and head.
I know, many of you are thinking this is a recipe for disaster: TSA will take my gear, it will get broken one of these days, or the bag will get lost. All of these are possible but in fact, I've done this numerous times now and nothing has happened except I get to travel lighter on the plane.
I looked into Pelican cases but I don't need such a high end case, just something that will protect the gear in case of a direct hit. These 5 images show the kit in various states of unpack/pack.
Oh, and in case you're wondering, I have a soft sided North Face rolling duffel and this case goes on the bottom with clothing on top of it. It has never moved or been compromised in any way and TSA has never opened it (that I know of) so it must look like camera gear in the x-ray image.
Something to consider for those of you who travel with a DSLR kit that you don't want to lug on the plane.